This works on a password protected sub page. Now I want that all news of the category Termine/News are on the parent page. So I put the code on the password protected parent page. Now the text is rendered - I only can see the shortcode text. But I should see all the articles!

What is wrong? Or do I missunderstanding something?

Edit:

Figured it out. There was some code directly in the template and so the content in the WP backend was totally ignored. Added the code in the template php file and now it works.